Resin composition for coating and paint

Abstract

There are disclosed a resin composition for coating which comprises a mixture of (i) a non-aqueous dispersion type resin containing (A) a vinyl polymer soluble in an organic solvent mainly comprising an aliphatic hydrocarbon, and (B) a vinyl polymer particle which is insoluble in the organic solvent and obtained by polymerizing a polymerizable unsaturated compound in the organic solvent using the vinyl polymer (A) as a dispersant, and (ii) a solvent type resin of (C) a vinyl polymer having a silyl group represented by the formula (I) which is soluble in the organic solvent: ##STR1## wherein R 1 represents an alkyl group, an aryl group or an aralkyl group, X represents a halogen atom, an alkoxy group, an acyloxy group or a hydroxy group, and k is an integer of 1 to 3, and a paint containing the same.

We claim: 
     
       1. A resin composition for coating which comprises a mixture of (i) a non-aqueous dispersion resin containing (A) a vinyl polymer soluble in an organic solvent mainly comprising an aliphatic hydrocarbon, and   (B) vinyl polymer particles which are insoluble in the organic solvent and obtained by polymerizing a polymerizable unsaturated compound in the organic solvent using the vinyl polymer (A) as a dispersant, and     (ii) a solvent resin of (C) a vinyl polymer having a silyl group represented by the formula (I) which is soluble in the organic solvent: ##STR5##  wherein R 1  represents an alkyl group, an aryl group or an aralkyl group, X represents a halogen atom, an alkoxy group, an acyloxy group or a hydroxy group, and k is an integer of 1 to 3, and    wherein said vinyl polymer (A) is a polymer which contains 60% by weight or more of a methacrylate unit having 4 to 30 alkyl carbon atoms or an acrylate unit having 4 to 30 alkyl carbon atoms and which does not contain a silyl group represented by the formula (I), and said non-aqueous dispersion resin and said solvent resin are contained in a weight ratio of 97/3 to 70/30.     
     
     
       2. The resin composition according to claim 1, wherein said vinyl polymer (A) is a polymer prepared from a monomeric material comprising at least one monomer selected from the group consisting of an acrylate or methacrylate each having 4 to 30 alkyl carbon atoms, and optionally at least one monomer selected from the group consisting of an acrylate or methacrylate each having 3 or less alkyl carbon atoms, a hydroxy group-containing acrylate or methacrylate, and an amino group-containing acrylate or methacrylate. 
     
     
       3. The resin composition according to claim 2, wherein said acrylate or methacrylate having 4 or more alkyl carbon atoms is selected from the group consisting of n-butyl acrylate, t-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, hexyl acrylate, cyclohexyl acrylate, octyl acrylate, isobornyl acrylate, dicyclopentanyl acrylate, n-butyl methacrylate, t-butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, hexyl methacrylate, cyclohexyl methacrylate, octyl methacrylate, isobornyl methacrylate and dicyclopentanyl methacrylate. 
     
     
       4. The resin composition according to claim 1, wherein the vinyl polymer particles (B) are a polymer prepared from a monomeric material comprising at least one monomer selected from the group consisting of an acrylate or methacrylate each having 3 or less alkyl carbon atoms, a hydroxy group-containing acrylate or methacrylate, and an amino group-containing acrylate or methacrylate. 
     
     
       5. The resin composition according to claim 4, wherein the vinyl polymer particles (B) are a polymer prepared from a monomeric material comprising at least one monomer selected from the group consisting of methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, N,N-dimethylaminoethyl acrylate, N,N-diethylaminoethyl acrylate, N,N-dimethylaminopropyl acrylate, N,N-dimethylaminoethyl methacrylate, N,N-diethylaminoethyl methacrylate and N,N-dimethylaminopropyl methacrylate. 
     
     
       6. The resin composition according to claim 1, wherein the vinyl polymer having the silyl group is a polymer comprising a monomer represented by the formula (II): ##STR6## wherein R 2  and R 3  each represent a hydrogen atom, an alkyl group, an aryl group or an aralkyl group; R 4  represents an alkyl group, aryl group or an aralkyl group; R 5  represents a hydrogen atom or a methyl group; R 6  represents a divalent organic group; A represents --COO-- or a phenylene group; X represents a halogen atom, an alkoxy group, an acyloxy group or a hydroxy group; a is 0 or an integer of 1 to 20; and k is an integer of 1 to 3. 
     
     
       7. The resin composition according to claim 6, wherein the monomer of Formula II is at least one selected from the group consisting of γ-acryloxyethyltrimethoxy silane, γ-acryloxyethyltriethoxy silane, γ-acryloxypropyltrimethoxy silane, γ-acryloxypropyltriethoxy silane, γ-acryloxypropylmethyldimethoxy silane, γ-acryloxypropyldimethylmethoxy silane, γ-acryloxypropylmethyldiethoxy silane, γ-acryloxypropyldimethylethoxy silane, γ-acryloxypropyltrichloro silane, γ-acryloxypropylmethyldichloro silane, γ-acryloxypropyldimethylchloro silane, γ-acryloxypropyltripropoxy silane, γ-acryloxypropylmethyldipropoxy silane, γ-acryloxypropyltributoxy silane, γ-acryloxybutyltrimethoxy silane, γ-acryloxypentyltrimethoxy silane, γ-acryloxyhexyltrimethoxy silane, γ-acryloxyhexyltriethoxy silane, γ-acryloxyoctyltrimethoxy silane, γ-acryloxydecyltrimethoxy silane, γ-acryloxydodecyltrimethoxy silane, γ-acryloxyoctadecyltrimethoxy silane, γ-methacryloxyethyltrimethoxy silane, γ-methacryloxyethyltriethoxy silane, γ-methacryloxypropyltrimethoxy silane, γ-methacryloxypropyltriethoxy silane, γ-methacryloxypropylmethyldimethoxy silane, γ-methacryloxypropyldimethylmethoxy silane, γ-methacryloxypropylmethyldiethoxy silane, γ-methacryloxypropyldimethylethoxy silane, γ-methacryloxypropyltrichloro silane, γ-methacryloxypropylmethyldichloro silane, γ-methacryloxypropyldimethylchloro silane, γ-methacryloxypropyltripropoxy silane, γ-methacryloxypropylmethyldipropoxy silane, γ-methacryloxypropyltributoxy silane, γ-methacryloxybutyltrimethoxy silane, γ-methacryloxypentyltrimethoxy silane, γ-methacryloxyhexyltrimethoxy silane, γ-methacryloxyhexyltriethoxy silane, γ-methacryloxyoctyltrimethoxy silane, γ-methacryloxydecyltrimethoxy silane, γ-methacryloxydodecyltrimethoxy silane, γ-methacryloxyoctadecyltrimethoxy silane, ##STR7## 
     
     
       8. A paint comprising the resin composition for coating as claimed in claim 1. 
     
     
       9. The resin composition according to claim 1, wherein the vinyl polymer (A) is a polymer obtained by copolymerizing a (meth)acrylate containing 4 to 30 alkyl carbon atoms with at least one other polymerizable unsaturated compound selected from the group consisting of a styrene, vinyl toluene, vinyl chloride, vinylidene chloride, acrylonitrile and acrylamide. 
     
     
       10. A resin composition for coating which comprises a mixture of: (i) a non-aqueous dispersion resin containing an organic solvent mainly comprising an aliphatic hydrocarbon and a vinyl polymer (A) soluble in the organic solvent, and   particles of a vinyl polymer (B) which is insoluble in the organic solvent and which is obtained by polymerizing a polymerizable unsaturated compound in the organic solvent using the vinyl polymer (A) as a dispersant, and     (ii) a resin solution containing the organic solvent and a vinyl polymer (C) which has a silyl group represented by the formula (I) and which is soluble in the organic solvent: ##STR8##  wherein R 1  represents an alkyl group, aryl group or an aralkyl group, X represents a halogen atom, an alkoxy group, an acyloxy group or a hydroxy group, and k is an integer of 1 to 3, and    wherein said vinyl polymer (A) is a polymer which contains 60% by weight or more of a methacrylate unit having 4 to 30 alkyl carbon atoms or an acrylate unit having 4 to 30 alkyl carbon atoms and which does not contain a silyl group represented by the formula (I), and said non-aqueous dispersion resin and a solvent resin comprising said vinyl polymer (C) are contained in a weight ratio of 97/3 to 70/30.     
     
     
       11. The resin composition according to claim 10, wherein said organic solvent is at least one selected from the group consisting of pentane, hexane, heptane, octane, decane, cyclohexane, methylcyclohexane, ethylcyclohexane, mineral spirit, mineral thinner, petroleum spirit, white spirit and mineral turpentine. 
     
     
       12. The resin composition according to claim 10, wherein the ratio of the vinyl polymer (A) and the vinyl polymer particles (B) is in the range of 10/90 to 60/90 in weight ratio. 
     
     
       13. The resin composition according to claim 10, wherein average particle size of the vinyl polymer particles (B) is within the range of from about 100 to 2000 nm. 
     
     
       14. The resin composition according to claim 1, wherein the ratio of the vinyl polymer (A) and the vinyl polymer particles (B) is in the range of from 10/90 to 60/40 in weight ratio. 
     
     
       15. The resin composition according to claim 1, wherein average particle size of the vinyl polymer particles (B) is within the range of from about 100 to 2000 nm.